The problem started on Saturday after a usual day of training, Yagin’s manager, Jason House, told MMAWeekly.com on Tuesday.

“He came home after practice, had a headache, started to vomit whatever liquids he drank and then decided to go to the ER the next day,” said House, adding that nothing out of the ordinary had occurred in training. Yagin hadn’t been knocked out or suffered from any particularly hard blows or anything of the sort.

Yagin’s family told House that there is blood around his brain that is causing swelling, thus, putting pressure on his brain, but they were told by his doctor that he believes surgery won’t be necessary, that the swelling should go down on its own in the coming days.

House stressed that he has yet to converse with Yagin’s doctors himself, but expects that Yagin will be in the hospital for at least the next few days to monitor his condition.

Yagin last competed at UFC 145 in April, where he won a split-decision over Mark Hominick in a Fight of the Night performance. He was originally slated to return against Siver at UFC 151 on September 1st, but that event was canceled, and the bout was bumped to December. So let’s all hope that 1) Yagin makes a full, swift recovery, and 2) that Siver gets a replacement opponent, because the dude is getting seriously jerked around lately.